Within the depth-psychology corpus, ‘secret’ operates on multiple registers simultaneously: as a psychic structure, a social phenomenon, a therapeutic obstacle, and an initiatory medium. Jung establishes the foundational tension: the personal secret is both a source of psychic isolation — a ‘psychic misdemeanour for which nature finally visits us with sickness’ — and, when shared within a protected container, a bond that builds genuine relationship. Hillman elaborates this paradox in the analytical context, distinguishing the Freudian impulse to dissolve secrets through cathartic disclosure from the deeper Hermetic understanding of analysis as itself a secret undertaking — a shared mystery rather than a clinical extraction. Burkert, approaching from anthropology, reveals the structural logic of secrecy: a secret derives its power not from its content but from the boundary it creates between initiate and non-initiate, a logic exploited by mystery cults and secret societies alike. Von Franz and Edinger trace the same dynamic into alchemy, where the ‘great secret’ of the Hermetic art cannot be transmitted scientifically but must be guarded, sworn to, and revealed only to the worthy. Yalom, from a clinical standpoint, demonstrates how an undisclosed secret in group therapy generates an ever-expanding web of inhibition, foreclosing authentic participation. Across these voices, the secret is not merely something hidden but a structuring force that shapes identity, relationship, power, and the possibility of transformation.